Five pairs of boots? Even the wealthiest of men can only sleep in one bed at a time!!
I have always been a believer in you purchase a pair of boots from new and YOU mould them in to fit your foot shape correctly by waring them for long periods. Using a second user pair of boots is just a recipe for sore and aching feet.
Second user shoes and boots are like using a second user tooth brush. Hell NO!!!

The only lessons in my life I truly did learn from where the ones I paid for!