I have five people in my household. Only one of them, not myself, doesn’t regularly loose important stuff. We are super adept at key replacement, Drivers License replacement, passport replacement, debit card replacement, etc. I travel with two phones, two laptops, and two kindles.

At this point if I haven’t lost my debit card in six months, I will just report it lost to change the numbers.

I have worked at financial institutions; while they are not infallible, they are all better at this stuff than my family, and usually work in teams for important stuff.

Zelle transfers into an institutionally insured checking/savings account at a major financial institution are pretty safe and people will get their money back. Zelle transfers from non-BoA accounts will have the records at the other banks to prove the transfers existed and they can be recovered that way. If BoA really lost the records and don't have backups and people lost transfers from BoA to BoA accounts and neither BoA account has a record of the transaction, it will just be a hassle for customers probably having to fill out some forms and wait a while.