I'm sure they won't bother. Too much an effort unless they're after a high profit which there isn't for the figures involved anyways.
Stop giving them ideas demonaclol.
Yeah even in darkness the figures do tend to revert, same thing happened to my Actionmaster Megatron, the cream seem to not work as effectively now on it when I tried . I gave it a good soak bath before under 1week sun in a bottle which restored it but after 2 yrs or so, signs of yellowing reared up and used the cream for 4 days coating, it didn't seem to whiten as like with the way it did before.