I had an Octavia collected a couple of weeks ago and although distanced, I watched the assessor. I feel it's important to at least let them know you are interested in their findings.
They vary wildly sadly although they all comply with BVRLA guidelines some are more 'bothered' than others, we use Arval, Lex and Network Lease
I sent a Golf back with a rear bumper that obviously needed replacement (split) and the charge was only a couple of hundred pounds.
I sent a Caddy back with a missing parking sensor, the invoice was £12.00 !! (bizare and it even detailed what it was for, so not a typo)
More recently I was in the office on a call when they came and they noted some marking to an Octavia bonnet, I went out and it was bird !Removed!, albeit a bit dollop but I wiped it off and questioned the guy, his answer was, yeah it usually etches.
I used to have the cars tarted up prior to returning them, including bit's of paint as they have 90-160k on when we return but over the past few years I've stopped this and taken the hit instead and I think I'm quids in. The most I've paid is £1300 on a 155k golf with a hard life, the last one went back @ £138 and I now budget £500 per vehicle.
Also remember they have it in the T's and C's that they will do a proper check back at the depot and I've had a couple of charges afterwards, but they will always send you a report with photo's of any damage etc. so take good photo's of every panel/wheel before they go.
I agree it can be quite concerning but don't be afraid to question them, I have and have had bit's knocked off.
The below was the last one, the dent was a trolley ding so happy @ £26 and the wheels were quite bad