before I bought from Amazon
Check that you bought branded toys. Some of the unbranded stuff can be dangerous junk from China (bad bells, weird woods, painted items etc). You can get some PP, SBC, Ceitec etc which are good, but the other stuff is a buyer beware situation for sure! Maybe post some pictures here and we can tell you if they look ok or not. I have bought toys online before, even from petshops, and not liked what came, or they weren´t appropriate.
Balsa, sola, mahogany pods, cork, yucca, and paper all seem to be popular with most of my lovebird customers
Those are all definitely faves in our house
edit; sola is not quite a fave for us, though it is a new one as it has only just become available to buy here, that i am aware of. i bought sola chips, i still have never found sola balls here.
Popsicle sticks, vine balls and dried leaf (banana or palm) too. And another thing my birds LOVE are natural cork perches.. I think they are up there in the top spot of faves.
I dont know where in the world you are, but if you are in the USA I would recommend a Bongo box from Shawna. She will personalise a toy box according to your birds likes and dislikes, obviously you can start with a small selection to see what works, and then next time you can adapt the box according to what were hits. If I were in the US, that´s what I would have, a reccuring monthly box.
Keep in mind, while your birds are still young, it might take a few times to pique their interest in a certain toy, colour or material, so something that is cast aside, re-try it later down the road, or try moving it somewhere else.