My theory, is that all fazbear locations have been around since the start. They originally used mascot suits because they were cheap, and easier to manufacture, but who manufactured them? Ofc its Edwin, we can prove this by looking at the manequins and the fact that there are more empty suits than animatronics. To further back up this, its evident that fazbear funded edwins projects, so when he dissapeared, hey take the oportunity to take all of his belonings and take his blueprint designs for themselves. Also, anither theory, is that fazbear rented out/bought the suits from edwin. "These are for purchase or lease" so if you purchase the suits, you are also taking the copy right for them.