Shining Santa Box caps for RED coins?

There are two new boxes: Shining Santa Boxes (the red ones) and the green boxes from Rudolph mobs.

Both of them give RED coins.

Is there a daily cap on coins from these?

I'm pretty sure that the red boxes have 30 coin limit.

My brother got to like 91-92 coins (in the first day), and then he ran out of boxes.. I guess there's no cap.. (?)
Can anyone confirm/disconfirm?
Frozen R's cap is 20.

Too bad evo doesn't drop santa box, they have crappy drop rate unlike crazy cubes.

I got 423 Santa boxes in 10 Dimensional PQ's, and 12% exp at lvl 202, during the event and using the free 2x drop buff. Out of 423 boxes i got 45 Red Coins so its about 1:10 average.

Opened 300 Santa boxes I got from Invade as well, got 29 coins, so it is about 1:10. Also, further confirming that if there is a cap on RED Coins, it's not 20.