Sad that I need to deal with this!
I was surprised not to receive confirmation on the price you were going to pay before you started storing the hay on the property. Please make fair calculation for the storage in the barn and outside on the land also. The cost will be for 2018 and now again for 2019 since it is already June.
if you would like I can assess the values I believe is fair.
Please be fair in your calculations. There are at least 2 covered barn locations and at least 5 outside ground locations. Most storage appears to large round bales and large square bales.
I am not sure if you took the time to research storage costs so I made some to help research to aid you in your calculation.
https://fyi.extension.wisc.edu/forage/files/2014/01/BaleStorage5-7-04.xls
https://fyi.extension.wisc.edu/forage/files/2014/01/HayStorCosts5-12-04.ppt
https://www.extension.iastate.edu/agdm/crops/html/a2-37.html
https://fyi.extension.wisc.edu/forage/dry-round-hay-bale-storage-costs/
https://fyi.extension.wisc.edu/forage/harvest/#hstorage
https://www.extension.iastate.edu/smallfarms/renting-out-storage-acreages
https://www.agweb.com/article/how-much-does-your-hay-storage-cost-naa-university-news-release/
http://factsheets.okstate.edu/documents/bae-1716-round-bale-hay-storage/
https://ag.tennessee.edu/arec/Pages/decisionaidtools.aspx
https://www.drovers.com/article/hay-cost-calculator
Thank you.