[EricH]

Oh, the fasteners? <R23> says that you don't need to worry about those, provided that the cost per item isn't over $1.00. List them, as knowing how many you use can help you in planning for later (and to comply with <R21>), but you needn't include the cost, except as noted above.

As for weight, you aren't required to include that in the BOM. It's included to help you get a weight estimate.