this cannot be right.

if router and stb are original equipment, they are yours after one or more previous contracts expired.

note router and stb have original 1 yr warranty only; if kaput, u need to buy yourself.
and they did not provide new ones for this cancelled contract, right?

modem, yes, need to return as this is always unifi property, theirs.

think u should go into tm point where u signed, ask to speak to manager, ask where in the contract says u need to return the old/expired stb.

the relevant question then is, "is the STB the property of unifi and under warranty at all times when u r a customer of unifi, whether valid or expired contract".

to my knowledge, the answer is YES for modem only. not for router and stb when 1st yr is over.

perhaps the answer varies from package to package, contract to contract... like they F around with diff prices for same package at diff times for diff people in diff areas!!