Saving and 70 or 80.
I used like 30 for first batch and got black flip before it retired. 2nd batch I used around 160 keys and got Sparrow hat, sparrow pants, sparrow boots x 2, sparrow vest x2.
After I used the 110 key batch I had where I uncrated all the sparrow noted above except the hat which I uncrated prior, I decided to save my keys from hence forth.