I Saved Terranigma from Toys 'R' Us

I bought this a few days ago from a Hard Off in Japan, but it came with some old Toys 'R' Us stickers.

Terranigma box with orange and yellow Toys R Us stickers
01 / BEFORE — The Terranigma box with the original Toys 'R' Us stickers still attached.

I managed to get the stickers off, but does anyone know how to remove the leftover adhesive? Maybe it'll get weaker now that it's exposed? I can get a little of it off with my fingernails.

Terranigma box after removing the Toys R Us stickers
02 / AFTER — The box after removing the stickers, with some adhesive residue remaining.

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