Customs & interception have just as much a chance as any other package so long as its packaged discretely. If it says "steroids" on the box then of course it'll be seized. Customs usually randomly hit packages. I can only guess that suspicious packages will take precedence. Of some 90 shipments of Blu-rays I've bought from the UK & France I've only had one ever checked out. It continued its trip to me taped up with a customs form inside. It can/has happened however I can't speak to what would happen if siezed, its way too much in resources to track down a simple order of AAS & attempt prosecuting an individual for it. It would require quite a bit of investigation.
Mail is pretty safe. IMO, if you can't except any loss then you shouldn't be spending the $$ on it.
As for quiting for work. Thats a pretty good idea until you find out if/how/what they test for. Almost all civilian busnesses that send away for drug testing don't spend big bucks on drug tests. Its really expensive if they want to test everything your on. I was parted out (tasked) to a lab in the lower 48 as part of a UPL (military review) & found the testing pretty good, most businesses just pay for simple "dip stick" testing, Example: 200+ specimens come in & are all tested with rather inexpensive testers & if positive are tested at a higher level to get an exact amount (PPM) for positive results ect.. Most test the main drugs Coke, Heroin, Weed.... It was a surprise to find that a lot of older drugs weren't tested anymore.
Hair tests & official medical tests (blood, urine, saliva) <from places like pain clinics> were extensive! Each costing $600+ literally stating everything in your system & charged per item found. I tried one when there (As I was on pain meds) & didn't mention the drugs I was on. They NAILED every one (although tests can show high & low amounts, they cannot say what is "toxic" to a user as tolerance differs), the cost would have been around $500 to my insurance for that test (if ordered). The newer "spoon" a cloth type flat (fiber looking) "spoon"or lollypoop, with a tip that changes color with enough saliva. It kind of like an oral "swab" that takes anywhere from 30 seconds to 5 minutes to saturate with saliva. Anyhow, I can go on & on with testing procedures, but I will say that the medical tests were the only tests I knew to check for AAS (because it was checked to look for). I wouldn't chance it, but highly doubt employers are footing the bill to Test everything down to AAS. So hang in there & find out
Wazz