If there is one thing I learned as a collector.
Make sure to write down all the data you have of your specimens the moment you receive it. Incase you are looking for to be more scientific.
Don't be like me and many other collectors who don't do that frequently and stand there with a massive collection that needs to their data written down.
I remember stuff from alot of these specimens but the thing is people that have these feathers afterwards let's say another collector or a museum will need to know where the specimen was obtained.
But fair I started when I was 15, I was rather more goofy than writing down stuff for my collection. Now I'm just like oh god this is gonna take months if not years.