I'd suggest you just go small for the mice as you can always offer 2 if needed down the road. Offer him/her a meal every 5 days and try to keep the handling down to a bare minimum. You want all this snake's energy directed toward regaining it's weight and good health.
Since you don't have any history on this poor little snake I'd really suggest having a fecal float done just to rule out any internal parasites. It's not an expensive test, most any vet clinic can do it (sometimes while you wait if you phone ahead) and it doesn't require the snake to be taken into the vet unless parasites are found and a treatment plan must be started.
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