As well as in many markets more homes than there are citizens to live in them ( think Detroit for an extreme example).The inventory by and large comes from tired and burnt out landlords. and it is most defiantly recycled..

Unless paper products for recycling are in big demand.  

Can I milk it for 7 more months?

Could you somehow "recycle" your own 4plex(es) and 24plex instead of selling and purchasing again?

It is 100% recycled pvc, so it is highly resistant to water and other spills.  

It's my opinion, that now they are trying to milk you, and because you have been so accommodating, they will be a pain in your rear if you keep them.  

Uslegal.com describes a slumlord as "A slumlord is an unscrupulous landlord who milks a property without concern for tenants, neighborhoods or their own long term interests."  

And he went through every bag with his bare hands, looking for recyclables.  

Just recycle them.

You are likely the one getting more free milk here.