So I have a couple of suggestion for how the item could work.

1. You buy the ticket in the mannco store or trade for it. The ticket itself can be traded.
2. However, the achievement items you get back from it, will remain un-tradable.
3. When used, the ticket gives the player a list of one of the items you can restore.
4. However if the item you select from the list is already present in your inventory, then you cannot redeem the ticket for that item.
5. Genuine promo items and vintage items (like the vintage lugermorph) do not count and cannot be redeemed.
8. If the achievement items had been used in crafting, transmuting, or deletion it can be redeemed, though if the player uses the redeemed achievement items in crafting again the resulting items will be un-tradable. I believe this part is the most important because it prevents the economy from being harmed and valve still makes money from ticket sales.
9. I believe the desired price of the ticket should $0.99 or $1.99