How to get those obscure dogtags?

I've searched everywhere that I could think of but I still don't know how to get the following dogtags:

"Dropped Call" - says it's a promo but from where and how do you get it?

"Reloading" - says it's for participating in a Portal game but I've played plenty of those and I don't have it.

"Restructured" - says it's awarded to Season 1 Portal creators who 'met the challenge'. Does this mean you just need to create any Portal game? Are there certain requirements?

Does anyone have any answers? I've checked all the youtube creators I know and did searches but the only ones I find are from the campaign and I have those already.