My 250 is 38mm measured from the back of the shutter to the rearmost edge of the rear cell. The same measurement on my 210 is 32mm. And, as mentioned before, the 250 requires a 64mm rear cap, the 210 uses a 60mm cap.
I would nicely explain the problem to the seller, providing all measurements and details. They should take it back, the item was clearly defective. Was "buyer protection" available on it? If so you may be able to file a claim if the seller won't refund.
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