Thanks for the answers!

I've checked all my cakes, and found the source of the infection: It
was a stack from the six famous montains. The wrapping of all of them
is damaged, three of them have lots of insects, and they are little
beetles, not moths like the the poopoo puerh, which makes me suspect it
is a bad infection. Or are all insects beneficial to the cakes?

If so, do you think it is a good idea to put the infected cakes aside
and wait for them to become something like Poo Poo Puer? The vendor is
really nice, and I wouldn't like to ask replacement for half of my
order :P

--k