I just got 4 Hibiscus plants in the mail after bidding on them on EBay, all the same buyer. They all came in excellent condition in 4 in. pots about 6 inches tall except the Valentine Day one which was 5 in. It's been about a week and all are doing fine except for the V. Day one.

It's completely wilted and looking quite stressed. Is it salvagable and if so what can I do about it?

I have it in a garden window but no sunshine around here yet. I plan on keeping it indoors because I live in the Pacific Northwest USA and it's too cool outdoors here.