Let’s guess where it could have come from. Egypt? Pakistan? These are two likely sources. Both of these countries have the ammo, but would they sell?
NATO countries made the mistake of neglecting artillery ammo.
Women and men work amid rows of artillery shells at the National Filling Factory during World War One. Nottinghamshire, England. 1917.
https://twitter.com/ExploringAlway/status/1766365223970013670