The anti-moisture packs will not have stayed perfectly dry indefinitely. If the chess pieces are in a box with no air movement and moisture and you have mold in the house, then mold is possible. Perhaps it would be better to keep the chess pieces out where there will be air movement. That way they are on display and you will gain more pleasure from seeing them out on a regular basis. Dusting them would be a pain though. How do your neighbours deal with the issue of mould growing in the houses in winter? It's not a problem in the UK where I live and I am surprised that it's an issue in Australia. Where abouts in Australia are you?
Out damn spot

please stop writing posts with more than 3 lines, it gets a special amount of mental strain to read them

A troll stack bumping in the most conservative forum category on this website, this should be fun.
Hang on a second...block, block and block.
Okay, thanks.

Hmmm, still dodging the salient point with childish vitriol, we see. You were at one time perceived to be in the vanguard of these forums. No longer, your childish nature is now exposed, painfully, I might add.
However, you could do a significant reparation for yourself if you/d simply pony up for a paid membership. No? That speaks volumes compared to the squealing we’ve seen from you so far.
why are there so many childish a$$holes here-like this dumba$$-that somehow think the diamond next to their name equates to meaningful posts?

A troll stack bumping in the most conservative forum category on this website, this should be fun.
Hang on a second...block, block and block.
Okay, thanks.
The troll of all trolls...
pot, meet kettle.

or, wait, maybe if he referred to himself in the third person with another name his posts might matter?
according to you?
as if you matter?

Eventually a mod will step in, dish out a few warnings, maybe a mute or two and then the topic will be locked after the 3 day mutes have been lifted.
It is a pattern that I have often seen, so I just block them man, problem solved.

I have been noticing a few things on this website recently.
The first thing may just be coincidence or perhaps simply be due to their nature.
People that are very vocal on the forums, the blatant attention seekers, are having their accounts closed for fair play violations.
I think that it is more than coincidence and if so quite clever. They wanted to get noticed and had a few warnings and mutes. So now they just flag the system so that EVERY SINGLE GAME that they play is ALWAYS CHECKED.
BOOM problem solved, use their own nature against them man without getting involved in stories.

The second thing is the most recent window, it is visible to everybody on the forums.
Groups of people have long abused it, posting one line comments in bursts mixed with diagrams to get the topic to float for ages as click bait.
But now it seems to have been upgraded with a flag system and a weighting system I think.
Now they can nerf your account as they wish without saying a word.
Keep bumping man and one day you will get a nice surprise, you will vanish from the most recent window and never be seen again.
Lol at this thread, I have no idea what I started, but it's hilarious!
For those who've expressed interest and offered advice, thanks and here is the result:
I ended up doing a few passes with the soap and water, letting it dry and reassessing. Unlike the joker who suggested I use a dremmel, I didn't want to abrade the surface, but in the end decided on a clean white rubber eraser to provide a little bit more friction. If you know where to look you can still make out the larger spot slightly, but it's hard to spot with the naked eye. My only concern is that renaissance wax provides a finish that is closer to a mat gloss then whatever the pieces were originally finished with as can be seen in the pictures above. I might at some point contact HOS and see what wax they use, but for now it will suffice.
To the British poster, I live in QLD by the sea, so usually quite a warm climate, but the sea air moisture does see the odd mold spots on the southern sides of houses. I would keep them on display but we've had a short rambunctious little man come to live with us recently who is liable to knock over the pieces so it's storage for now, until he gets his act together. The coffer seems to seal well, considering it's just timber and felt, perhaps I'll get some more moisture packs and give the pieces all a new coat of wax to protect against further spotting.

That looks beautiful now, fantastic. I love the description of the "short rambunctious little man who has come to live with us recently". Yes, I don't keep any chess sets with all the pieces in my house for similar reasons. Now I hope that the spot does not return. If it does, perhaps try posting on a wood restoration site, as well as this site. While less hilarious, the answers might be more practical. Queensland looks pretty!
you reminded me of a word-dense.
'cause it's currently winter in oz.