Hi steltz, thanks for writing back! I understand that copyright needs to be observed, and that it is easy to falsify IP addresses.
I conduct a little orchestra here in Melbourne, Australia. A reason why we could keep doing what we do is because of access of public domain parts through IMSLP's help. We would prefer not to have to hire parts that are already in public domain here, we are such a small orchestra that we need all the help we can get! We have always been appreciative of the IMSLP community and have been performing this long because of your support. The orchestra's called Orchestre Nouveau, my name's Zach Tay and I could send you some physical correspondence from Melbourne if that will help you verify our location.
How do you feel about helping us? Please contact me via DM if you're happy to speak with me about helping us with this technicality. I am assured that performing this here in Melbourne is legal because it is out of copyright, and I have verified this with Hal Leonard. if it were still in copyright we will be exposing ourselves to liabilities that we cannot afford.
Please help us, thanks!