Should Pero Shakes and Burgers be saved?

[DragonSR]

Just wanted to know if I should use them all during this event in fear of loosing them next event or save.

[Mithril]

Just wanted to know if I should use them all during this event in fear of loosing them next event or save.

Event description say it with a note:
"Temporaly recovery items Pero Shackes & Pero Burgers gathered during Gambit 4 will expire at the beginning of the next PeroPero event"