Sweet drink that was not sold before Pesach

We have a sweet drink (Gamp grape drink) without a special kosher-for-Pesach certification, which is in a suitcase that we took with us to the hotel. At home we made a partial sale of chametz through the rabbi (not on the whole house). Do we need to pour out the drink before Pesach, or is it permitted to leave it in the suitcase and keep it for use after Pesach?

Shalom u’vracha 

Before Pesach you should have sold it, out of doubt that it might be chametz. 

However, after Pesach it may be used, since it is only a possible chametz that Pesach passed over. 

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