The Rossum Corporation contracts people to be Dolls/Actives in one of their Dollhouses for five years. At the end of the contract,
they are paid a large sum of money and certain memories are erased from their original personality profiles. For the Doll/Active, no time has passed in their mind over the years.
We are explicitly shown that
Madeline/Mellie/November sets up in an apartment nearby. Anthony/Victor is sent to a hotel for the night before returning to his life.
Some of the Dolls/Actives must have had someone notice they were missing in the five years they were gone.
Caroline/Echo even runs into an old teacher in the episode "Echoes".
Is it ever explained what, if any, sort of cover story Rossum provides either during or after the employment to explain the person's absence?