What does this sign mean????

[Dave Grimson]

Looked at a house that has some potential for the BRRRR strategy but have a question i'm hoping someone has some experience with....

Its a bank owned property (REO) and they slapped a quick coat of paint on basically the entire interior, then put this sign up everywhere. Has anyone else seen this before? I asked the selling agent if it might be mold but she says that she asked the bank but they're not giving her any answers.

Any help would be greatly appreciate, looking to make an offer.

Thanks,

Dave