You do not have to mail in the spreadsheet with Form 8453 and Form 8949.
If you're required to mail in forms 8949 and 8453, do so within three days after the IRS has accepted your e-file. Here's the mailing address:
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
@Jeff_AZ
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