Personally, I've done both many, many times..bring onto flight vs send ahead. My preference is send ahead. THIS IS ALL AT YOUR OWN RISK..If I didn't make that clear. Merely a suggestion as the OP was looking for..
I know for a FACT there are NO X-rays or dogs in those PRIVATE corporations. They would NEVER budget that type of money or slow down their production..they CAN randomly inspect..which they do. Random inspections are usually reserved for questionable packages..FEDEX new policy is ON TIME or FREE..you be the judge.
I did a ton of research before trying out my theory and it works like a charm every time..AT MY OWN RISK of course.
I do want to add that I send small amounts which is what OP was looking to do as well..a thought just occurred to me..if you are concerned with theoretical X-ray, foil line your package or foil cover, put in thermos..there's a million ways..AT YOUR OWN RISK