I rarely see made in USA stuff, like the older Milwaukee, Porter cable, and craftsman/Black and Decker Industrial, despite it obviously being older and in service longer.
I'd wager that new Milwaukee branded power tools made in the USA haven't existed in the general consumer universe for almost 20 years. I haven't looked at a new corded Milwaukee power tool in a long time, but I doubt they are made in the USA.
The last of the mostly non-China made Milwaukee cordless tools were in the original NiCd 18V platform.
That general timeframe likely applies to most consumer grade power tools.
The RIDGID corded woodworking tools made by Emerson Electric and sold at Home Depot also disappeared then.
So, you are looking for tools that for the most part, would be well beyond their service life if they were actually used frequently. Or, they are no longer used and may have been discarded.
I can probably count on one hand the number of times I have used a corded Sawzall in the last 15 years or so, outside of work. A lot of corded tools like a Sawzall or circular saw or drill were displaced by cordless tools for many homeowner and other light grade users.
A framing carpenter wouldn't use a Milwaukee 18V NiCd cordless circular saw all day, every day, but that was my go to saw.
Now there are true cordless equivalents to corded standbys like a Sawzall and circular saw- even a worm drive and table saw. They do chew up the batteries though. A fast charger is really needed on a jobsite.
I have seen the Milwaukee cordless table saw and worm drive saw used on a commercial jobsite. The cordless M18 Sawzalls, rotary hammer with vacuum attachment, compact bandsaw, deep cut bandsaw and impact drivers and more have all generally held up to daily abuse from employees generally not giving a **** about the tools because the tools aren't "theirs". By the time the tool breaks from daily use and some abuse, it is not cost effective to repair it or mess with it when the labor rates for lost time are considered. There should be a brand new one on standby to keep the job moving. Many employers have not yet grasped this simple concept. The tools are mostly disposable and need to be eventually replaced.
Of course, the individual that goes out with a mission to destroy employer provided tools is a problem, but not that common.
I hardly see any yellow or blue tools on jobsites. I remember when it was all yellow. Then blue. Now it is mostly red, which is a problem because people steal batteries.
And of course, most (if not all) of the new stuff is made in China.