what does mean if "not" hundreds in this sentence?

yuji8

At least, that was the case untill the early 1990s, when suddenly fast food
chains came into vogue and sales began to dip. By 2000 scores, if not hundreds,
                                ^^^^^^^^^^^^^^^
of currywurst stalls had closed amid soaring unemployment and changing eating
habits.

Question: what does mean where letters got \"^^^^^^\" underline in above?

petersheng

hundreds of scores of currywurst stalls