I recently moved my 3 pups from one setup to another. I put them in a
cooler for about 1-2 hours while I moved/transferred other fish and
transferred filtrations.
After I put them back they buried themselves for about an hour or so
then they came out and started exploring.
Yours are probably just stressed from all the commotion in the tank.
Maybe it wouldn't hurt to let them settle down and see if they start
coming out more and make sure they are OK. Usually they are stressed
or spooked when they stay buried that much.