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No need to BUY a box. Just use an empty (well cleaned & aired) plastic coffee can. I use a four pound yogurt tub, but most of you won't have that available. Just make holes in the lid of whatever you use. Drop the bird in, snap the lid on, and weigh. You can tare out your scale first, or you can deduct the weight of the container after you weigh the birds. Either works.
For the record, if you weigh in grams you'll have more detailed/accurate measurements. Get a scale that weighs in one or two gram increments. Mine weighs in 2 gram increments & a single 9 volt battery lasts ages. (I've had this scale at least three years and have replaced the battery only once.)