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IIRC, the only way you can tell if it's a replacement motor is that there is something on the serial number to ID it as such. Other on the board may know what that is.
I only mention it since there was a range of engines on the '99' model ( I used to have one) that were produced with "pushed in" cylinder sleeves, because of a casting problem with the supplier of the blocks at that time.
Essentially, because of a shortage of good blocks, they had to take rejects and machine them to take a regular cylinder liner that was pressed in instead of the cast process that was being used. A number of engines with the pressed in liners failed because the liners started to move around after a while, causing an engine failure.
The cars affected were produced somewhere in a 10/98--3/99 time frame. If you have a June car, the odds are probably good it wasn't affected and has the original motor.
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2013 Boxster S
2006 Boxster--sold
1999 Boxster--sold
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