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The engine is definitely a factory reman due to the "AT" designation:
Engine serial numbers have 8 digits.
1st digit - No of Cylinders
2nd digit - Engine Version
3rd digit - Model Year
4th-8th digit - Serial Number
On a MY2005 Boxster the original engine would have the number 615*****.
Depending upon the year of reman, it could carry the oversized non serviceable bearing; the only real way to know for sure is to pull the flywheel and look at it, if it has the large 22MM center bolt nut, it is the oversized bearing.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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