I know its not right.
When I use to work for a aftermarket store we always had the problem. Later on talking to the vendors who make thee regulators and stators all told me they test the parts before they go in the box to be sold.
Now the foreign vendors do that I don't know.
Even auto stores give you the same answer.
I'm not saying he did something wrong but if you owned the store and sold the fuel pump what would you say if you all ready sold say hundred and no body brought one back.
Thats the problem with buying on the net your at there mercie