Does it work?
I updated my Prowl script and all went well. I don't use boxcar anymore, but I added the same changes into the boxcar script. Upon doing that I noticed boxcar changed their API, quite a long time ago at that. So I updated the API code so it would work with the new boxcar API. However, since I don't use it anymore I haven't actually tried to see if it works. The changes were kind of minor which is why I hope it still works.
One issue however could be UTF-8 encoding, I think everything is sent as UTF-8, but I actually don't know. Once verified that the new script works by whoever(email me or something) this issue will be marked as resolved and closed.