If you successfully deprimed at least one case, then they are boxer primers. You might have broken your pin by failing to have your case centered on the shell holder.
Yes, there are several brands (most, if not all, foreign manufactured) of cases that are berdan primed. Berdan primers are easy to identify by the two off-set flash holes.
I have reloaded cases marketed by PMC from both Korea and South Africa. Both had boxer primers and the brass has proven very satisfactory for reloading. That is not to say that they may have or have had another source of 223 brass with berdan primers. Always examine unfamiliar cases before attempting to reload.
By the way, berdan primed cases can be reloaded. Just need the proper equipment and a source of the replacement primers.