I've had similar, can't remember whch courier though at a gues it ws also hermes.
I wasn't in
neighbou signed for it
no note was put through letter box to say which neighbour had signed for it, or indeed that it was anywhere in the neighbourhood.
I said: where's my parcel?
they said: delivered and signed for
I said: no it isn't
they said: here's the signature
I said: not my signature
they said: (nothing)
mystery was cleared up when same courier delivered something else (not mine this time) to same neighbours and came and knocked on my door when they said the previous parcel was still with them.
Luckily for me I was in that time. Courier claimed he had put a note through the letterbox. (ho hum, stupidity rather than malice in my case)
So it may be worth the putative recipient asking their neighbours.
We also had a case when parcel #1, not needing a signature, was let in porch, plus note through door saying parcel left with neighbour at xx. We assumed this related to parcel in porch and courier had changed their mind in between.
It was only when <offspring> started wondering aloud about the 'other' parcel that we twigged and fetched parcel #2 from neighbour.