Monster cards

Some monster cards seem to be level-restricted, much like meso/equip drops. I noticed this when doing Sakura castle (or whatever that castle with the toad final boss is called) on my bowmaster and xenon.

I first did it on my bowmaster (200), and merely assumed the cards did not drop, and doing all the quests, I did not find a single card. However, while doing it on my Xenon, I noticed monster cards dropping for all the mobs, so I went back to check my Bowmaster to see if I had the cards already. I did not, so I'm thinking that it might be level restricted, though it would be great if someone else can confirm/refute this.

And if such is the case, is there a way to still get the cards on my Bowmaster?

The only restriction is being at least 14 levels under the mob(within 15 levels of it), any above that can see the card if you don't already have it *unless it's a boss mob.
For bosses however, if one is partied with you, and THEY hit the mob at all and would be able to see the card, you will too, regardless of your level and whether you'd be able to see it alone or not.

As for Sakura Castle mobs, their cards were the ones of Ninja Castle before Sakura came out, so if you obtained the cards there, they wouldn't drop. You could complete the short questline and kill the toad boss(his card drops 100%, being a boss) to see that they drop. You could just have silly luck for not seeing regular mob cards. s: