[pc86]

Honestly I can't envision that conversation happening between two real people. What is much, much more likely to actually happen in my experience:

"I found this phone."

"Ok." takes it

You go in later "I lost my phone, do you have it here?" and they hand it to you. For particularly fastidious store clerks they may ask you to describe it before handing it over. And you likely have to wait while whoever you ask asks all the other employees if they found a phone.

It's not clear to me that letting the phone just sort of drift through the ether toward the Waymo Depot while who knows how many other passengers use the car is any better than putting the phone at some other fixed location behind at least some cursory level of security.