They could have been. Nothing says that they weren't. If Mark was written in the 40s, they well may have been. They were reading whatever they had. Their Scripture was no more inspired than ours. The principle applies.
"They were reading whatever they had."
They were Jews in the Synagogue at Berea, Blogger. They were reading the Septuagint (not your later, different version of the OT).
I've got to bake the Vasilopita now. Have a Happy New Year!