Hi,
I bought a 2009 Corolla CE the other day and found a plastic bag with 2 oval rubber plugs in it:
IMPORTANT
To pre-delivery inspector: Insert these rubber plus into the holes of the center floor side member extensions.
I looked at where the bags diagram pointed to and found the holes where these plugs were supposed to go: under car, right before the rear wheels.
The dealer would not tell me what they were for

The dealer told me to leave it until I brought it in for an oil change.
Toyota was no help...they told me to call the dealer back.
What are these plugs for? Should I put them in?
What else should I / could I check over for myself?
TY for reading, Any good help appreciated.
Mike