Cool! Interesting that they had switched to G3s as quite a few photos show them G1 armed in photos supposedly from the 1980s. No doubt it was a gradual transition and the G1s would have been getting a little long in the tooth.
The Bavarian Border Police did of course patrol the border but only in Bavaria, naturally enough. Lots of photos showing them doing joint patrols with the US Army, the Underfire Polizei seem a decent match.
I painted mine and converted some other figures for the West Berlin police. The old Wargames Factory/WG Zombie Survivors box had a number of useful Walther SMGs. I suppose I should look into the West Berlin Bereitschaftspolizei.
Oh, forgot to mention it but Eureka has a sniper with a PSG1 sniper rifle in their modern German range. He has a beanie/ woolen watch cap and jacket with hood. he does have a stab vest but it's easily filed back to look like part of the jacket.