Your money is made or preserved in the buying never just the selling.
Buy right enables you to sell right.
When selling something like this lens The only thing you have as a point of difference to other sellers is Price as most are in excellent condition, any defects however small usually effects price.
You may face challenges selling or need to discount as some buyers may not be so understanding, also as time goes on more mint condition units may be on the market giving buyers better choices.
You know many buyers usually want virtually unused perfect mint condition at a cheap price.
I am surprised the seller hasn't mentioned a price to you, that alone moves me on.
Insect repellent can destroy paint and even melt plastic if left on long enough, imagine what it does to your skin or organs.
I am surprised repellent didn't get on anywhere else.
If $1500-$1600 is the market defiantly $1250 is a starting point. No more than $1350.
Only an opinion