twistidd,
not sure what area you are hunting.
(Chicago, north, west, south

)
Not sure your going to get much just eyeballing
out in the woods.

Few here and there.
Forest Preserves do offer more, but you really
need to do the digging. Stuff on top has been
picked over for many years.
Try checking out the sides of any old roads you
may come across; make sure you give extra time
for the old roads with a drop off on the sides. Prior
to being forest preserves many would use the old roads
to dump their trash out of the truck.
Nothing better to do, try checking out some stream beds,
just follow them; keep a good eye out on the side of the
streams, or when the streams have high banks. Following
the streams often is better than just looking for traces of
old roads, they help give away the location of those roads.
Even if you don't come across any bottles, it always makes
for a interesting hunt day
Check out the modern roads that run near the woods. Work
about 20 -30 yards in from the road, just follow the road.
Gets thick at times, but that is where you may run across
something. Look for shards, use your detector for metal,
again check out gullies.
Hope you come across some ; they are out there
Just takes a lot of hunting.
Don't forget the regulations out in those urban woods

Major digging is a no, no.
Not much more I can say.
If I did do any digging, when I was done, you would not
know I was there.
Also, welcome here at Treasure Net.
have a good un.......
SHERMANVILLE