Depending on what it is cover it up.
A few years back, the only route to get chemicals for the school was to have them smuggled over the border from China in people’s cars
I ordered what I thought was 5 ampules of bromine, what I received, mixed in amoung the 3kg of group 1 metals inc 25m ribbon of lithium, and conc acids was a very leaky and smelly bottle of bromine – 500gms of the stuff.
There was no hazardous waste disposal available in country, no way to own up to having it as it was smuggled in, and not something that anybody else other than me would understand.
I hid it on the roof for a few days in a box, subzero temps so not too worried about it evaporating while deciding what to do with it.
Own up, own up after disposing of it, pretend it never happened and leave on roof, or get rid of it.
There were large piles of rubbish around the town in winter due to it not rotting. I thought I could just sling it in there and nobody would notice, but if it did leak, it might make national headlines.
Winds were strong in the evenings so I could pour it off the roof and and the cloud would be carried away, but it may be spotted.
Eventually I decided the best method of getting rid of it was to take a 2 mile hike into the mountains armed with arm length rubber gloves, goggles, a carried bag and telling my wife the rough direction i headed in just in case i poisoned myself.
Trekked around 2 miles in -25 degrees, through waist deep snow, over hills, around cliff faces to a remote area, unpacked the bottle, loosened the cap, and set at an angle so that it was always just heading towards the slightly undone cap. Nearly gassed myself on initially opening it and went home.
Nobody knew, nobody ever found out.