Value of Leonardo Collection Christmas Ornaments?

It looks like you have one or two legitimate Leonardo ornaments but I believe the others may be 'knock-offs'. There are a lot of these around and a lot of people are showing them as "Leonardo' but many are just look-a-likes.

If the box does not have the Leonardo name shown somewhere, then it will not be an authentic item and it's best to just show it as an 'unbranded' item.
It looks like one box does have the Leonardo name printed and you're showing one item with the Leonardo mark.
These will be authentic but any of the others, without the Leonardo brand on the item, will be 'knock-offs' and need to be shown as 'unbranded' when listed for sale.
I do not see a lot of difference in price between the Leonardo items and the unbranded items.
The value of similar items seems to run between $8-$25.
It may be difficult to find your exact items so perhaps you should list your items at a higher starting price - even $35-$45 and leave them posted for several weeks. If no offers, then reduce the price and wait again.
Christmas items usually start selling more often in November.
There are several good sites other than eBay.
Facebook Marketplace is good.