“Someone has gifted this for a new baby with no note on what it is.”
Answer: “It is a door silencer. It wraps around and covers the latch on a door so that it doesn’t latch, and the rubber also makes the door open and close silently. The straps go around the doorknob on each side.”
I have one that has been in use for over 80 years, there is nothing missing on it.
Driveway marker