Well I think I found the confiscation numbers. According to this website
https://davekopel.org/2A/LawRev/american-revolution-against-british-gun-control.html
“On April 23, 1775, Gage offered the Bostonians the opportunity to leave town if they surrendered their arms. The Boston Selectmen voted to accept the offer, and within days, 2,674 guns were deposited, one gun for every two adult male Bostonians.”
Of those who were involved in offenses in Boston to the crown (The Minutemen) but not the entire population of Boston.
Interesting read.
Props to David Kopel. It was he and the late Mike Vanderboegh who uncovered the Gunwalker scandal. You doubtless found his home page at https://davekopel.org
Those just starting out researching should also be reading Dr. John Lott’s site http://johnrlott.blogspot.com/
And Stephen Halbrook, although his site is pretty dense.
The most thorough dead tree treatment of the events of 1775 is, IMHO:
“The Road to Concord: How Four Stolen Cannon Ignited the Revolutionary War” by J.L.Bell
https://www.amazon.com/gp/product/1594162492/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
His site is https://boston1775.blogspot.com/