Talk

The court won't tell you what to do.

You need legal advice.

You can refer it back to court if the order/questionnaire requires documents to back up response, or you can write to your ex to say that in the absence of evidence you are going to ask the court to draw an adverse inference (i.e. he still has the shares and the car).

How strict are judges with documentary evidence will they just take his word for it? Investments are with same company he works for so states entries (which tie in with dates dividends are paid) are just work expenses and are confidential so he can’t give any further info? Is this correct! How can inferences be drawn if you have no idea whether he has any investments left and if he has how much they are worth? Also high earner but years of missing pensions just says he didn’t pay into one?

You really need to pay for someone to look at what you've got and give you some pointers. Hard to comment on a situation we only have sketchy details about.