Fanboy Forge has some new hidden objective markers available over in their webshop.
Personally, I think they’re kinda awesome.
From the release:
Do you need to hide those pesky objective values? Keep’em hidden with these.
The kit includes one #1, two #2s, two #3s, and one #4 @ 40mm diameter. Six mystery markers @ 25mm diameter. Cast from resin. $10 + $3 shipping USPS.