Custom SPF Record

ah, realized had quick question about the text record.

in the sub domain location (part before the .fwla.com.) what do I put for spf record?
I had one that looked like this:

_amazonses.fwla.com
TXT
v=spf1 include:amazonses.com include:box.fwla.com -all

right now I decided to grasp at straws and add:
box.fwla.com
TXT
v=spf1 include:amazonses.com include:box.fwla.com -all

_box.fwla.com
TXT
v=spf1 include:amazonses.com include:box.fwla.com -all

LOL. Anything else I should add? or deleteā€¦ha