Punctuation question/opinion

[Naola "Sam" Vaughn]

Does anyone hyphenate Bates stamp in these instances:

1. Bates stamp number (i.e., Q. Please look at the Bates stamp number at the bottom of the page.)
2. Bates stamped document (i.e. Q. We were provided this Bates stamped document from your attorney.)
3. Bates stamping (i.e.: When you were doing the Bates stamping, did you happen to notice...
4. Bates stamped (For the record, I have a document that is not Bates stamped, as the others are.)
Thanks

[Mary Ann Taylor]

I probably would hyphenate No. 2, but I'm sure it could go either way and be just fine.

[Jennie Ann]

I would hyphenate No. 2, "Bates-stamped document," since it is being used as a descriptive adjective for the noun "document."

I would not hyphenate Nos. 1, 3, and 4.