Gifts on my doorstep: sender unknown!

I arrived home from work yesterday to a huge box on my doorstep. I realized it was from Bed, Bath and Beyond.
Inside was a platter and glass set that I had registered for but no invoice, card or anything else.
I've already asked both sets of parents if they have any idea...they don't.
I'd like whomever send the goods but it is a mystery!!
Any ideas?

You can call BB&B and they can look it up for you as long as the person purchased with a CC. I had some mystery items missing from my registry but hadn't received them. They could only tell me where they were bought, but I figure out from that who got them for me.

Good luck!