Moral dilemma

Imagine a purely hypothetical PhD student, who for illustrative purposes only we shall call Judy. Judy ordered an expensive piece of scientific equipment that needs a specific power pack ordered with it separately. When it arrived Judy discovered that the equipment, which we shall say purely for the sake of this example costs ten times as much as the power pack does, worked perfectly but that there was a problem with the power pack. Judy phoned up the very helpful scientific equipment supplier who offered her a replacement power pack.

This morning a parcel was delivered to the lab where we're going to pretend she's based, containing another piece of the very expensive equipment, rather than its power pack. Judy now has two options, phone the supplier to ask for a replacement power pack and send the piece of equipment back, or just buy another couple of power packs.

On the one hand Judy is doing a PhD which she, perhaps rather egotistically, thinks will be of benefit to a large number of people and which will go a little faster with twice as much equipment. On the other hand Judy's Mum managed to instill a fairly powerful sense of Catholic guilt in her which has proved rather harder to shake off than the actual beliefs themselves and she's started thinking about the employees of the scientific equipment supplier sleeping on park benches with only a pile of glossy pamphlets on PCR supplies between them and the elements.

What should Judy do?