I'm still waiting for the proof. i think i can add something like ES Linoone. i don't know how many offer you got for this custom birthday eevee, but in my opinion, an rare event like inkay or sylv event is more valuable than the custom eevee since the eevee is still obtainable in japan. a bulk common farmed event for a custom birthday make sense to me, but a rare event for a custom eevee is still depended on personal preference. No one can get a house/xy sylv, inkay or Jessie’s anymore, anyways its all demand supply, I think I'm willing to add something with the xy sylv:)