millipede molt?

[EndlessForms]

i've been told that when a millipede molts it will bury itself for a long period of time. i have a 'pede that has only been underground for a week or so. the reason i know he hasn't come out is because there are no 'nibble marks' on his food source. my question is: is this a likely molt? or is it just normal behavior?

 

[Elytra and Antenna]

They can stay underground for many weeks without molting. If they're on top most of the time it's usually because they're unhappy or hungry. It also depends a lot on the species.

 

[EndlessForms]

yeah i've only had him for a couple of months and he usually buries himself every day but almost always comes out at night! he hasn't for the last few days though...it's a juvi A. gigas by the way