A parcel was delivered to my address today
By post, or by courier? It makes a big difference.
If by post, you can just mark the parcel "not at this address" and hand it in at the PO.
If by courier, in theory you can phone them to collect it; in practice they may not want to know.
Failing this, you can try DIY detective work if you want, or just keep it for a time in case someone asks for it, and if not dispose of it.