Unless they're incredibly bulky, I'd leave them where they were (maybe even keep using the monitors) until they took reasonable steps to reclaim them Collectio

Unless they're incredibly bulky, I'd leave them where they were (maybe even keep using the monitors) until they took reasonable steps to reclaim them Collection is their problem, as is them not being insured. If something insurable happens to your home, frankly someone else's monitors are the least of your concerns and you'll likely have the paperwork from insurance claims on your own stuff to prove it. If it doesn't and the items just don't work next time they plug them in, that's their problem and not one they're likely to waste time and money following up with you over.