Are collectibles list always changing?

[ChameleonMS]

Best thing you can do at this point is hold on to your items and keep an eye out for them to show up again.

Yes, I have done this before. When levelling my Cul from 60-70 I was making Loquat Juice for Leve turnins but I had unfortunately left Collectable Synthesis turned on and made 10 before I even realized what I had done. I stuck them in my retainer and sure enough, about 5 days later, it was a Red Scrip turnin item.