Might be notes inside or other issues inside I didn't look at each page.  Might have a musty or cooking smell but it is faint.  Might have moisture edge waving.   I ship only on Wednesdays and Fridays and use plastic envelope mailers. 

I also use fabreeze plug ins.   Smoke free

I try my best to combine shipping leave a note at checkout.   Also shipping is just getting more and more expensive by the month.  Gone up over a dollar in 1 year