To Swap Back, the token stops existing and the original card is returned to the space that the token just occupied, inheriting all current effects and statuses. 1. Any card that has been Replaced by that token or any tokens it Replaced is eligible to swap back in this way.
§ 438.7.b Core Rules PDF (officieel)
§ 438 Replace
§ 438.7 Tokens that have been Created through a Replace action can be instructed to be “Swapped back.” This may also appear as “replace [the token] with the [Game Object] it replaced.”