Pas De Rouge Slingback shoes

Pas De Rouge Heels Size 37.5 Taupe brown suede leather Low block heel Slingback style Snakeskin print trim on bow (unsure if it’s real or faux) Excellent condition, barely worn, but both heels have a faint square void on each heel (almost as if it had a sticker on it). Unsure what it is as I bought these new myself, but did purchase at Nordstrom rack so perhaps they were there due to this flaw. I have not tried to remove it.