It may well be within the manufacturer's 'normal' range. Drive speeds and capacities are pushed to where errors are unavoidable, and recovered by the drive's internals.
If you know what a 'bathtub curve' is, you would understand that a large amount of reallocated sectors in the first month could well be expected. maybe not 1000, though - I have never done the type of investigation you have.
(Note that, back in the days of huge 10MB scsi drives, a new drive would have a list of maybe 10 bad sectors printed on its label. The user had to enter those sectors in to the software as part of the setup. A new drive will have some bad sectors, guaranteed. It's just that the drive now takes care of the, not the software.)
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