The package is hand-delivered, because it was easier and cheaper to swing it by himself than to arrange for Fed-Ex delivery. Even Loki has limits to how far he'll go for a joke. (Cost: $25. Time: 1 hour.) The bottle of saffron vodka is accompanied by a note in neat print.
For the record, I'm not actually a Brit - I only play one on television.
The signature is an almost unreadable cursive scrawl (initials L.L.), but who else would be sending curry-inspired liquors?