To report a non-fault non-claim bump for the next 5 years?
What if someone dings my door in the shopping centre, do you want me to report that too?
Depends:
Do you think the shopping trolley ding is likely to have caused hidden structural damage to your car?
Do you think they are likely to claim on their insurance for damage to the shopping trolley?
If the answer to either of those questions is yes, then of course you should.