I got Spanish cards from an English booster box. is it even possible?

Kerbis7

Hi all,

I’m not sure that this is the right group but I really don’t know where to look.

I opened English booster box of Silver Tempest and in some packs I’ve opened the rare card was in Spanish.

Not all packs was is Spanish and I opened a sealed box.

Any idea how this happened?

Any chance I bought a fake box?