Hi - I want to just pop in a few points here:
Australian police are working with NZ police and advising NZ party pill distributors not to ship to Australia, if your shipment is delayed ask for a refund - check whether it was shipped or not so you know whether it is sitting at Customs.
The report above is an excellent report, well done for taking the time to post something like this with such detail.
At the risk of sounding like a Grandma, it is not advisable to take other unknown substances with piperazines, even if you have some really sophisticated apparatus I am sure that others would agree with me that assuming that some black market pill contained MDMA and then making assumptions on the drug interactions based on that is flawed logic.
There has been one death in Zurich where the person had both BZP and MDMA in her system, it had all the marks of a classic ecstasy death (she drank 10 litres of water) but the advice has to be to avoid the combo if possible.
Harm reduction advice would be that when combining drugs, remember that effects are often multiplied rather than additive, so take half the normal amount if you MUST do it, but try to avoid combos.
If you experience a piperazine related headache, they have been noted to respond to ibuprofen, 5HTP may actually prolong / increase the headache. Some phenyl piperazines promoted as legal highs many years ago are actually used to produce migraines.
Read the labels really carefully on NZ party pills, you may find that they say something like:
just an example said:
100mg Benzylpiperazine 85mg additional piperazine/vitamin blend
What this means is that there is 100mg of BZP, and then some unknown amount of probably TFMPP, say 50mg and perhaps 35mg of Vitamin C.
All the party pill companies are competing and trying to protect their exact formulations, we're encouraging a standard whereby people declare exactly how much BZP is in the products so peopel declare that and then blur the lines on what the remaining ingredients are. In this respect it is advisable to follow the instructions rather than making assumptions.
I hope this is helpful.
[edit: PS, the size of the 50mg 5HTP capsules coudl be deceptive, remember the capsuling and tabletting process require the additoin of free flow agents and so forth to act as dry lubricants in the machines, so 50mg 5HTP pills will contain more than just the 50mg of 5HTP]