When exactly are these special boxes gone?

Currently the boxes are crap. The previous are (ultra) were value for coin.

Special boxes leave on 03/11

The raid pass box was nice, but there was literally NOTHING of value in the Ultra box for me outside of them. Almost feels like I got scammed out of my iTunes card. 25 Lucky eggs? I don't need XP. Potions...revives...ya kidding? Not everyone's in a revive drought.

It is not bad for me, i just buy it for the premium pass
No need for XP now, but i dont like to just throw an item, so i just use the egg everytime i play...

The current boxes certainly don't have the most exciting content variety, but I'd be hard pressed to call them crap by any stretch of the imagination.

You get 20 raid passes for 1480 coins (ultra box). Given that said 20 raid passes will normally cost 2000 coins if bought individually, you're getting 5 free raid passes out of the deal. Then everything else in the box (lucky eggs, max potions/revives) are freebies tacked on. Even if you throw all that stuff away, you're getting value out of the raid passes alone.

Also, I don't think we know when the next set of boxes are coming, so there could be a decent period of time without any. If you like raiding, this box is a good deal.