This is a mistaken that could have easily been fixed.
I mean Hook could have said the sword actually belonged to Rumpel and that Mila took it when she was ran away for protection and kept it ever since. Sure, it’s a bit wordy, but it beats a plot hole.
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"I could have the giant duck as my steed!" --Daniel Radcliffe
Keeper Of Tamara's Taser , Jafar's Staff, Kitsis’s Glasses , Ariel’s Tail, Dopey's Hat , Peter Pan’s Shadow, Outfit, & Pied Cloak,Red Queen's Castle, White Rabbit's Power To World Hop, Zelena's BroomStick, & ALL MAGIC