I recently sent a request for verification with an agency, and after two weeks they responded asking for more information.  Apparently full name, phone number, work and personal emails, and TER membership with whitelist aren't enough.  They also wanted a DL picture AND electric or phone bill.  Wow.  I haven't hobbied in a while so my references are older, but really?  I've been able to set up meetings with great providers with just a phone number or email address.  Maybe it's just that my respectful nature shows when communicating with independent providers

I'd be curious to know which agency this is, PM me if you want.

So no way would I give them even more.  They already know who you are and we have seen any number of agency busts where we heard that all that client info fell into the hands of LE.

I will give my first name, P411 ID (not even a member anymore), TER handle, hobby phone # and hobby email and that is it.

Even if the fuzz don't seize all that information in a bust, a prosecutor will get his or her hands on it. The agency's lawyer would  likely tell it to turn over the client info voluntarily to get a better plea deal. I never would've done that.

I'm not too concerned.  I haven't actually used the agency in question, and my request was for verification only-not booking or any questionable communications.  Plus, the agency supposedly doesn't keep all of the information after verification.

I gave dedicated hobby phone number and email address in this instance.  From now on I think those two, first name and TER info is enough, as you say.  I've never been asked to show ID, but I wouldn't have obliged that request in the past, nor do I intend to in the future.

I would not count on that being true.

I believe this request is common for verifiers. For P411 I gave drivers license, phone bill and they did a work phone verification. I decided to trust them because they are based in Canada, they are commonly used in this area and I felt it was safer then giving each individual provider verification information. It seems to me that LE forcing a Canadian company whose business requires privacy to give up records, assuming they don't destroy them as they say, is very unlikely. I think it is a far more common senecio that LE gets information from a local computer, phone or whatever was confiscated as part of an investigation. That being said you should not give anything you are not comfortable with.