Accessing PLINE positions (PLST PLEN) that have been deleted

I am writing a program that relies on accessing PLST and PLEN (PLINES)

Problem is, the company I work for have deleted some of the standard PLINES that I need to access and that define the basic shape of the section profile

Is there any other way to access these positions, like maybe through SPVE or something. Only thing is these don't have a position and is more a local relative thing

Any help is appreciated