Beating a high-tech spy/thief with low-tech

I have a character who breaks into a police station/municipal building to steal evidence that would exonerate a good guy and hides her tracks. She is smart and sophisticated and good at what she does, and very, very condescending.

There is much panic over this good guy not getting his name cleared.

I have another character who is a curmudgeonly old b***ard who I want to be able to thwart her fancy schmancy techniques by going old-school and paranoid on her.

So that when everyone thinks all is lost, Curmudgeon breaks out with, "Did you think I'm stupid", reveals his possession of back-up evidence as well as a security system that couldn't be hacked by her modern techniques.

I was thinking maybe something like an old fashioned game camera (motion-triggered used by hunters).

It's a small part of the story, and I need just enough hand-wavium to make it plausible, if anyone has any tips or ideas.

Thanks!

I like! Especially the potential for later mockery.

Now, I would worry about making her seem too stupid to not notice a trip wire, and whether a trip wire would be necessary if the nanny cam was constantly recording or motion-activated.

Maybe if the security system that she overrides is wireless (I know nothing about wireless, this is wild speculation), and either the nanny cam is on a different wireless frequency, and she's targeting specifically, so she doesn't disable the secondary security, or the nannycam has a memory card/usb port that can download the information.

Maybe low-tech is the wrong phrasing.

The end result would be that she's so smart and technologically sophisticated that she gets tripped up by out-of-date methods. Almost but not quite a genius with no common sense, a victim of the modern age where people forget how to tell time on an analog clock, schools don't teach kids to write in cursive, what's-a-phone-book? way.

Oh, the potential for so much crack!

The item being stolen is physical, and she actually does get it. It's proving who stole it (and therefore getting it back) that's the issue.

Maybe low-tech isn't the answer. Maybe he's a curmudgeon who's a tech genius, and there's a tracking device --ooh! He's so paranoid that he handed over a fake of the real item, and the fake has a tracking device in it. She's destroyed the fake by now, but the gps tracking was already logged. Too outlandish? It's kind of a noir story with supernatural elements . . . hmm, maybe the curmudgeon has a gift . . .

I was trying to think of a way to apply the bank note tampering dye. But what if the zinc sulfide was released at foot level in a subtle manner? If she was wearing gloves it wouldn't matter. And it would coat her shoes and she wouldn't be paying attention to what's going on silently down below. She'd leave tracks, shoe size, sex, weight, etc. as well as, if they guess that it was her, evidence to be found in her apartment.