Yeah i bet they have a broken one. Any serial numbers recorded? If not take it up with courier company and try get proof of delivery to shut them up. I hope you didn't use ebay
A smart scammer would just claim they never received it and get a full refund straight away as you didn't use a signed for service. It could be legit.
Then claim compensation from the service you used that agreed to obtain a signature of a recipient and left the parcel outside to get rained on.
Id be unsure if to or not, Are they trying to make a claim against royal mail with the info off the receipt? Id let them open a case, Offer return and claim against the postal service if its correct.
but if ebay do get involved prepare to bend over and be royally ******!