I get it. They built a ceiling around the condenser section. In answer to your question. Yes. I've seen criticaly charged cap tube systems drop to 10psi at startup, raise to 17-22 as the box cooled down and drop even lower as box hits temp. With no nameplate you'll have to charge by superheat. The other variable you do not know is if the last guy or last two guys put their guages on the system.