Question about adding another key and fob

[rcvmini]

Hi everyone,

I did about 2 hours of searching and can't get a clear answer so I hope I can get some answers here.

I bought an 2009 Yaris 4d hatchback that came with just one remote entry 3 button key. I would like to ad a 2nd and 3rd key/keyfob with the same functions to use daily and leave the master at home.

1. The key I have now has a DOT on the blade so I take it I have a transponder? How can I tell if it's the MASTER key?

2. If I buy a USED yaris key that is the same model number from another yaris off eBay can I pair it with my car using the open door and keying "dance"? Or will that only work if I buy a NEW key fob?

My plan would be to buy a used key fob take out the internals and put it in a flip outstyle key body and get the blade cut.

My concern is if a used key will require me to have to take it into the dealer then I might as well spend the extra and buy a NEW virgin key.

So is it possible to buy a used key and DIY this?